Originally Posted by Byron0022
I have personally seen it cause issues with 92f mags. We were taught to rotate our mags periodically.
The problems were more likely one or some of being dirty, rusty, out of spec, constantly being loaded and unloaded as often happens when used in military security roles.
Leaving a spring compressed inside its designed parameters will not hurt it. Its scientific fact. Its the movement itself of compression and decrompression that damages springs.
You do far worse damage to a magazine by unloading them to "let them rest" and none at all just leaving them loaded.
That being said, unless you shoot a damn lot of rounds, like in competition, or sit in front of the tv just loading and unloading a magazine your never going to wear one out.
Its a non-issue. Keep them clean, wipe down the springs and internal parts when you clean your gun and they will last several lifetimes